Curioso lo que me acabo de encontrar visitando el foro de lan.st.
Post de Mathieulh:
Default psp official firmwares hidden feature
It looks like vshmain checks for the following button combination at startup :
SQUARE + TRIANGLE + SELECT + START
When this combination is issued (you need to hold the buttons before the Sony Computer Entertainment screen shows up) it will restore all the settings to default (so you will need to select the language, timezone etc etc again)
This hidden feature works from 1.00 to 3.90 so far (and probably ongoing firmwares)
I believe this must be used in service centers to deal with psps that somehow have settings issues and cannot boot otherwise (without the need to reflash them)
It is really suprising that this trick wasn't found out that far, looks like no one really looked into vshmain before.
Traduciendo, si al arrancar la psp pulsas a la vez CUADRADO+TRIANGULO+SELECT+START reiniciarás los valores de la flash 1
... y tanto time sin salir a la luz, que palo da!
